Evacuation and sealing of tins and the like metallic containers



l 630,2 16 May 24, 1927. H. J. POOLE EVACUATION AND' SEALING OF TINS ANDTHE LIKE ETALLIC CONTAINERS `.Filed oct. 1. 1921 Patented May 24, 1927.Y

Y ',EvAooATroNiAnnsnArInG-or Tins AND Tyrannen ivrnfrarinizof.veOitTArivERsf application filed october 1,*71921, serial Ng;

This invention relates tothe evacuation of tins or otherfwholly orpartlymetallic air-- tight vessels, and in particular to the method of sealingthe tins or the' like when evacuation has been elfected.

, In a ,co-pen'ding application Serial No.v

444,815 filed 14 February 1921 there is declosing the evacuationpinhole,athinmetal` lic disc ,is vsubstituted and this dise is permanentlyaffixed 4over the pinhole bysoldering.

The sealing disc, Which may be of lead i foil or ottin or copper orother metal or alloy suitable for the purposen yis placed iii positionover the pinhole prior to the evacua#r tion vof the air and is held bysuction during. evacuation. in the manner described in theVafore-menti`oned specification, 'against the `face of a spring-urgedplunger by whichitis pressed over thepinhole to cloethe' latter f whenthevacuumis broken, the metalliczdis j f Y being then permanentlyVal'lixedin thisposi- 'tion by a drop Vof molten solder 'orthe'likeAlternatively, t-he disc maybe of a lSolder v alloy or one or both otthe surfaces to be application of heat.V f v for carrying theinf,V

usealed together'maybe prepared beforehand by coverinlgifv it or themWit-lila filniy ot solder "so that the disc maybe permanently alixed,

after the" vacuum is 'broken Anf apparatus suitable vention intopractice Vcomprisesxa specially Aformed suction nozzle,shoivninelevation in Fig. 1 and 'in longitudinal sectionfin Fig. -2

of the accompanying drawings which show the apparatus prior to oraft'erL evacuation of the air, thenozzle being connectedr With an fevacuat'ing. device suoli as, for l example, any suitable'ki'ndofmechan'ical pump and vaeuum chamber, this nozzle a having a lut-ingringe?) preferably of india riibbewvhich is pressedagainst the Wall' cofthe tinso as to 5.04,?683fana in Great Britain r11-heat; 1921;?"1"

include the pinhole d, andl a spring-urged plunger e centrallyarrangedrthe function of which Ais to `press the thinmetallic disc f.upon the lsurface ofthe vessel over the hole d so as to seal theflatter`automatically vwhen' the puin'pis cutolior thevacuumrisbroken. Theplunger e has a central *f aperture g extending-'axially tliroug'h'itand a'collarxel vwhich,isseatedunderthe'actionfot thefspring- Y' I i onan internal shoulder carvotjthe nozzle ci,v

the nozzle is rapplied b v handto the tiny-with soas to .close thenozzle aperture fao.- When ay sealing` disc in position over the pinholei and the luting` ring b pressedl down into close contactivith thetinand the .connection v.with

` the exhaustingdevice established` the conselquent reduction ofp'ressui'ein rearf of the collarvalve ef causes the plunger@ tojbeWithdrawn,against'th-e force of the spring and with vit the sealing discf which is held by suction against theft'aceof the plungen the pinholevalbeingconsequently uncovered c to permit evacuation of vthe tin.evacuation ol' theY tin-1s completed `the Vvaeuum v vith'in the.nozzleisbroken, whereupon Then the l the :Sealing` disc is instantlypressed. over the 1 pinhole by the' spring-urgedplunger e and I by thepressure the hole. Y The nozzle may of' the atmosphere and seals haveattached v'to it a'guid` y evacuated, soastoV ensure the Aregistrationof the plunger Wit'hthe pinhole d, and this guide maybe adjustablysecured` as by'ineans jing' device indicated at lll-'(F 1 for c`eii`tralizing the tin' or other container' to beV of. set'scretvs liupassingthrough slot it". in

vthe guide and" screwedjinto' the nozzle Yilange,l

to: suit different sizes aiidsha-pes of. tins orf.v

may be interchangeable With'others adapted.

for; tins of different shapes'andsizes.`

c "1f the sealing' disc is of a readily fu'sible 'siniply by tliematerial such asflead or tin foilait may be permanently affixed in'tljie sealingv position by fusionto the tin' Vor the lileby means of adrop Voffmoltensolder. Otherwisethe ico surface ot' thecontainer'around'tliefpinhole] and thesurfa-ceotl the sealing disc inContact'` 1 therewith may be prepared beforehand by coveringthem-ivith,a lni of solderfso that, l` Y lthe disc may bey a'lixedgater the vacuumis broken, simply bythe application 'o'fheatg or processi.

f Having vthus i thenature of the" L f thefdis'c-niay be permanentlyfusedtothe tiir i. `by electric or otherl autogeiious WeldingFri fholes: nftns of other 'Inetamllif'gV or partly 0x' heat.

said nventon'andv the bestmans I knOW such suction andtherebyc-ausnv*the dSvC'JO of cairyngthesame intoprac'tcal effect/I t() Y be Vappliedautomatically to1 t: 1e pnhOlQ K. Vclanu-- tot-fseal the latter, and"their permanently metalli contanersywhich Comprles'holdng' 'l lhtestimony xt'llfeo'f have my fir-5 a 'met-ally@ dlsclu'a posit-1011'oppslte to the name to this 'speci.`lct`10n, f 'pmhole and ready forsealmf, by rSu'ctxon i 'during,therewfxttatn ofthe tnjnterlvupting n.HENRY J

